Adaptive video processing apparatus and method of scaling video based on screen size of display device

ABSTRACT

Provided are an apparatus for processing adaptive video and a method of scaling video, which generate a graphical user interface (GUI) so that a GUI suitable for the screen size of a display device can be displayed according to the screen size of the display device. The apparatus can realize a GUI most suitable for the screen size of an external display device connected to the apparatus by enlarging or reducing the size of the GUI according to the screen size of the external display device, or by changing the arrangement of items arranged on the GUI.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application claims priority from Korean Patent Application No.10-2007-0085856, filed on Aug. 27, 2007, in the Korean IntellectualProperty Office, the disclosure of which is incorporated herein in itsentirety by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a video signal scaler and an apparatusfor processing video, and more particularly, to an adaptive videoprocessing apparatus and a method of scaling video, which can provide agraphical user interface (GUI) suitable for a screen size of a displaydevice that is to display the GUI by changing the size and configurationof the GUI according to the screen size of the display device.

2. Description of the Related Art

Conventional multimedia devices, which were once limited to videoplayers and DVD players, have recently diversified, as digitaltechnologies have developed, into MP3 players, personal digitalassistants (PDAs), and portable multimedia players (PMPs).

A recent multimedia device, such as a PMP, supports a TV-out function,which transmits and outputs a video signal to an external displaydevice, such as a TV. Such a TV-out function displays a video signal bysuitably scaling the video signal to a screen size of the externaldisplay device.

FIG. 1 is a diagram for describing a conventional TV-out function.Referring to FIG. 1, a reference numeral 110 denotes a PMP as an exampleof a multimedia device, and a reference numeral 120 denotes an exampleof a GUI displayed on a screen of the PMP 110. Also, a reference numeral130 denotes an external display device connected to the PMP 110, and areference numeral 140 denotes a GUI enlarged and displayed on a screenof the external display device 130 using a TV-out function.

Referring to FIG. 1, a video signal that is to be displayed on thescreen of the external display device 130 is scaled according to theratio of the screen of the PMP 110 to the screen of the external displaydevice 130. Here, when a horizontal length of the screen of the PMP 110is X and a vertical length of the screen of the PMP 110 is Y, and ahorizontal length of the screen of the external display device 130 is X′and a vertical length of the screen of the external display device 130is Y′, the video signal is displayed on the screen of the externaldisplay device 130 after a horizontal component of the video signal isenlarged by the ratio of X:X′, and a vertical component of the videosignal is enlarged by the ratio of Y:Y′. According to such aconventional technology, the GUI 130 for a user input of the PMP 110 isalso displayed on the screen of the external display device 130 afterenlarging a horizontal component by the ratio of X:X′ and a verticalcomponent by the ratio of Y:Y′. As described above, a GUI screen of anapparatus for processing video, such as a PMP, is always enlarged orreduced by the same ratio of a video signal before being displayed on anexternal display device.

However, when a GUI, which is formed to be suitable for a small screenof a PMP, is displayed on an external display device, which has a largescreen, by scaling the GUI by the same ratio of a video signal, oralternatively, when the GUI is displayed on an external display device,which has a smaller screen than the PMP, by scaling the GUI by the sameratio of a video signal, the GUI may be overly enlarged or reduced.

Also, a GUI displayed through an external display device has a fixedform and it is not possible to change the configuration of the GUIaccording to a screen size of the external display device.

SUMMARY OF THE INVENTION

Exemplary embodiments of the present invention provide an apparatus forprocessing video and a method of scaling the video, which can adaptivelychange the size or configuration of a graphical user interface (GUI) ofthe apparatus according to a screen size of an external display deviceconnected to the apparatus.

According to an aspect of the present invention, there is provided anapparatus for processing video, which provides video data by beingconnected to a predetermined display device, the apparatus including: adisplay device information reader, which reads display deviceinformation that includes information about a screen size of the displaydevice; a graphical user interface (GUI) data storage unit, which storesdata about a GUI displayed on the display device; a GUI controller,which generates a control signal for changing at least one of a size andconfiguration of the GUI according to the screen size of the displaydevice; a GUI generator, which generates a GUI by changing the at leastone of size and configuration of the GUI according to the controlsignal; and a video processor, which combines and processes thegenerated GUI and an input video signal.

According to another aspect of the present invention, there is provideda method of scaling video displayed on a predetermined display device,the method including: reading display device information, which includesinformation about a screen size of the display device; generating a GUIby changing at least one of a size and configuration of a GUI displayedon the display device according to the screen size of the displaydevice; and displaying the generated GUI on the display device aftercombining the generated GUI with an input video signal.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present inventionwill become more apparent by describing in detail exemplary embodimentsthereof with reference to the attached drawings in which:

FIG. 1 is a diagram for describing a related art TV-out function;

FIG. 2 is a block diagram illustrating an apparatus for processing videoaccording to an exemplary embodiment of the present invention;

FIG. 3 is a diagram illustrating a graphical user interface (GUI)generator illustrated in FIG. 2 according to an exemplary embodiment ofthe present invention;

FIG. 4 is a table of GUI generation information according to anexemplary embodiment of the present invention;

FIG. 5 is a diagram illustrating a GUI displayed on a screen of anexternal display device based on the screen size of the external displaydevice according to an exemplary embodiment of the present invention;

FIG. 6 is a diagram illustrating a GUI generator illustrated in FIG. 2according to another exemplary embodiment of the present invention;

FIG. 7 is a diagram illustrating a video scaler according to anexemplary embodiment of the present invention; and

FIG. 8 is a flowchart illustrating a method of scaling video accordingto an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE INVENTION

Hereinafter, the present invention will be described more fully withreference to the accompanying drawings, in which exemplary embodimentsof the invention are shown.

FIG. 2 is a block diagram illustrating an apparatus 200 for processingvideo according to an embodiment of the present invention.

An apparatus for processing multimedia, such as an MP3 player, apersonal digital assistant (PDA), or a portable multimedia player (PMP),may be used as the apparatus 200. However, the apparatus 200 is notlimited to the above, but various other apparatuses which provide videodata to an external display device can be used. Also, various devices,such as a conventional TV, a Liquid crystal display television (LCD TV),an LCD computer monitor, a plasma display panel (PDP) TV, or aprojection TV, may be used as an external display device connected tothe apparatus 200. While describing the present invention, it is assumedthat the apparatus 200 and the external display device are connected viavarious wired/wireless interfaces. For example, the apparatus 200 andthe external display device may be connected via a wireless interface,such as Bluetooth, Ultra-wideband (UWB), ZigBee, wireless local areanetwork (WLAN), binary, Code division multiple access (CDMA), InfraredData Association (IrDA), wireless, or Universal Serial Bus (USB)communications, or via a wired interface, such as IEEE 1394,High-Definition Multimedia Interface (HDMI), serial, component, orcomposite communications.

Referring to FIG. 2, the apparatus 200 includes a video decoder 210, avideo scaler 220, a video processor 230, a graphical user interface(GUI) data storage unit 240, a GUI controller 250, a display deviceinformation reader 260, and a GUI generator 270.

The video decoder 210 restores a video signal by decoding video data,which is input from an external video source, according to a compressiontype of the video data. Here, the image data may include all ofbroadcast signals, which are transmitted via a broadcasting station orthe like, and video signals, which are read from a predetermined storagedevice.

The video scaler 220 outputs the input video data by scaling the videodata so as to be suitable for a screen size of the connected externaldisplay device. Here, the input video data may be scaled using aconventional method, and thus details thereof are omitted herein.

The display device information reader 260 reads display deviceinformation about the connected external display device. The displaydevice information includes information about the screen size of thedisplay device, and may additionally include information about a modelname of the display device, a scaling ratio of a GUI according to thescreen size, arrangement of on screen display (OSD) menu items displayedon the GUI, the number of text lines displayed on the screen, and thenumber of columns displayed on the screen.

The GUI data storage unit 240 stores data about GUIs displayed on thescreen of the apparatus 200 and the screen of the external displaydevice. For example, picture files of items displayed on the GUI may bestored in the GUI data storage unit 240.

The GUI controller 250 generates a control signal for changing the sizeand/or configuration of the GUI by using the information about thescreen size of the display device read from the display deviceinformation reader 260, and outputs the control signal to the GUIgenerator 270.

The GUI generator 270 generates the final GUI by changing the sizeand/or configuration of the GUI according to the control signal.

FIG. 3 is a diagram illustrating the GUI generator 270 illustrated inFIG. 2 according to an embodiment of the present invention and FIG. 4 isa table of GUI generation information according to an embodiment of thepresent invention.

Referring to FIG. 3, a GUI generator 300 includes a GUI generationinformation storage unit 310 and a GUI changer 320.

Referring to FIG. 4, the GUI generation information storage unit 310stores information about a scaling ratio of a GUI according to a screensize of an external display device, the arrangement of items displayedon the GUI, information on the number of lines that should be displayedon one screen, and information on the number of columns displayed on onescreen is stored in a form of a table, in order to generate a GUI havingthe size and configuration suitable for the screen size of the externaldisplay device connected to the apparatus 200. Here, the scaling ratioof the GUI is an enlargement ratio or a reduction ratio of a horizontaland/or vertical component of the GUI based on the size of the GUIdisplayed on the apparatus 200 according to the screen size of theexternal display device. For example, “1:0.8” denotes that when the sizeof the GUI, which is scaled by the same ratio as that of the video dataand displayed on the external display device, is 1, the scaling ratio ofthe video data displayed on the external display device is not applied,but instead, 0.8 times the scaling ratio of the video data is applied.In other words, when the screen size of the apparatus 200 is 320×240 andwhen the screen size of the external display device is 640×480, thevideo data is displayed after being doubled respectively in vertical andhorizontal directions. However, the GUI is not doubled respectively invertical and horizontal directions but enlarged 2*0.8=1.6 times.Meanwhile, FIG. 4 illustrates that one scaling ratio is applied to bothhorizontal and vertical components, but a scaling ratio may be differentin each of the horizontal and vertical components according to thescreen size of the external display device.

The GUI changer 310 generates the final GUI by rearranging the GUI byusing the information about the screen size of the external displaydevice, which is input through the GUI controller 250, information aboutthe scaling ratio according to the screen size of the external displaydevice, which is stored in the GUI generation information storage unit310, and configuration information of the GUI.

FIG. 5 is a diagram illustrating a GUI displayed on a screen of anexternal display device based on the screen size of the external displaydevice according to an embodiment of the present invention.

In FIG. 5, a reference numeral 510 denotes an apparatus for processingvideo according to the present invention and a reference numeral 520denotes a GUI displayed on the screen of the apparatus 510. A referencenumeral 530 denotes an external display device connected to theapparatus 510 and a reference numeral 540 denotes a GUI enlarged anddisplayed on a screen of the external display device 530.

Referring to FIGS. 3 through 5, video data provided from the apparatus510 and displayed on the external display device 530 is enlargedaccording to the screen size of the external display device 530similarly to conventional video data. In other words, when a horizontallength of the screen of the apparatus 510 is X and a vertical length ofthe screen of the apparatus 510 is Y, and a horizontal length of thescreen of the external display device 530 is X′ and a vertical length ofthe screen of the external display device 530 is Y′, the video data isdisplayed on the screen of the external display device 530 after ahorizontal component of the video data is enlarged by a ratio of X:X′and a vertical component of the video data is enlarged by a ratio ofY:Y′.

According to the present invention, when the GUI is processed, the sizeof the GUI is not scaled by the same scaling ratio as that of the videodata but is scaled by a ratio different from the scaling ratio of thevideo data by using scaling ratio information of the GUI, according tothe screen size of the external display device 530, stored in the GUIgeneration information storage unit 310, and then the GUI is displayedon the screen of the external display device 530. Also, theconfiguration of the GUI is changed according to the screen size of theexternal display device 530 by changing the arrangement of thumb-nailsdisplayed on the GUI by using arrangement information of items of theGUI stored in the GUI generation information storage unit 310.

For example, when the screen size of the external display device 530 is32″, the GUI changer 320 reads a scaling ratio of 1:0.8 of the GUIaccording to the screen size of the external display device 530 of 32″stored in the GUI generation information storage unit 310, andarrangement information of 5*3 of items displayed on the GUI. Then, theGUI changer 320 changes the size of the GUI by using the scaling ratioof 1:0.8 of the GUI. For example, when the screen size of the externaldisplay device 530 is twice as large vertically and horizontally as thescreen size of the apparatus 510, the video data is doubled bothvertically and horizontally and then displayed, but the GUI is enlargedto 2*0.8=1.6 times and then displayed. Also, the GUI changer 320rearranges items 522, displayed in a 2*4 thumbnail format on the GUI 520of the apparatus 510, to a 3*4 thumbnail format 542 by using thearrangement information of 3*5 of the GUI according to the screen sizeof 32″ of the external display device 320.

FIG. 6 is a diagram illustrating the GUI generator 270 illustrated inFIG. 2 according to another embodiment of the present invention.

Referring to FIG. 6, a GUI generator 600 includes a GUI scaling ratiocalculator 610 and a GUI changer 620.

In the GUI generator 300 described above, the GUI is rearranged usingthe scaling ratio of the GUI or the arrangement information of the itemsof the GUI, according to the screen size of the external display device,contained in the pre-stored GUI generation information. However,according to the GUI generator 600 according to the current embodiment,the GUI scaling ratio calculator 610 does not separately include the GUIgeneration information, but calculates a scaling ratio and thearrangement of the GUI so as to be suitable for the external displaydevice by using the information about the screen size of the externaldisplay device input from the GUI controller 250.

The GUI changer 620 generates the final GUI by rearranging the GUI byusing the scaling ratio and arrangement information of the GUIdetermined in the same manner as the GUI changer 320.

Referring back to FIG. 2, when the display device information read fromthe display device information reader 260 not only contains theinformation about the screen size of the external display device butalso contains the scaling ratio information or arrangement informationof the items of the GUI, the GUI generator 270 may skip separatelycalculating the GUI generation information but rearrange the GUI byusing the scaling ratio or arrangement information of the GUI read fromthe display device information.

The GUI controller 250 outputs the GUI rearranged according to thescreen size of the external display device to the video processor 230.

The video processor 230 outputs the rearranged GUI after combining therearranged GUI with decoded input video data.

The output unit 280 is in charge of wired/wireless communication withthe external display device, and converts the data output from the videoprocessor 230 to a format that is suitable for an interface with theexternal display device, and outputs the converted data to the externaldisplay device.

Meanwhile, according to the present invention, the GUI controller 250outputs the control signal to the GUI generator 270 so that the GUI isgenerated so as to be suitable for the resolution of the externaldisplay device, by using resolution information of the external displaydevice connected to the apparatus 200. Also, the GUI generator 270 canchange the resolution of the GUI by up-scaling or down-scaling the dataabout a GUI, which is stored in the GUI data storage unit 240, so as tobe suitable for the resolution of the external display device. In thiscase, the quality of the GUI, in which the resolution is changed throughthe up-scaling or down-scaling, may deteriorate, and thus the data abouta GUI suitable for the resolution of the external display device may bereceived from a predetermined external server, stored in the GUI datastorage unit 240, and then used.

FIG. 7 is a diagram illustrating the video scaler 220 illustrated inFIG. 2 according to an embodiment of the present invention.

Referring to FIG. 7, a video scaler 700 according to the currentembodiment of the present invention includes an input video typedeterminer 710 and an input video scaler 720.

The input video type determiner 710 determines a scaling portion that isto be enlarged or reduced in video data according to the type of decodedvideo data or selection of a user. The type of the video data may beincluded in header information of the decoded video data, and when thevideo data is a broadcasting signal, the type of the video data may bedetermined using broadcasting information in an electronic program guide(EPG). For example, when the type of the video data is for reproducing asports match, a part with a lot of activity may be determined as ascaling portion. Also, a scaling portion can be selected by the user orcan be selected from among pre-set scaling portions. Alternatively, apredetermined video data portion can be determined as a scaling portionby the user.

The input video scaler 720 enlarges or reduces the video data of thedetermined scaling portion so as to be suitable for the screen size ofthe external display device.

FIG. 8 is a flowchart illustrating a method of scaling video accordingto an embodiment of the present invention.

Referring to FIG. 8, a connection status between a predeterminedapparatus for processing video, which provides video data, and anexternal display device, which receives the video data from theapparatus and displays the video data, is checked in operation 811.

In operation 812, it is determined whether usable display deviceinformation about the connected external display device exists. Asdescribed above, in order to generate a GUI according to the screen sizeof the external display device, the display device information shouldcontain information about the screen size of the external displaydevice. Besides, the display device information may further includeinformation about a model name of the display device, a scaling ratio ofthe GUI according to the screen size, arrangement of OSD menu itemsdisplayed on the GUI, the number of text lines displayed on the screen,and the number of columns displayed on the screen.

When it is determined that the usable display device information existsin operation 812, the display device information is read in operation813. When it is determined that the usable display device informationdoes not exist in operation 812, the display device information is readfrom an external server in operation 814.

In operation 815, the GUI is rearranged by changing the size and/orconfiguration of the GUI displayed on the external display deviceaccording to the screen size of the external display device. Asdescribed above, when only the information about the screen size of theexternal display device is stored, the GUI can be rearranged by usingthe GUI generation information table, pre-stored with information abouta scaling ratio and the arrangement of items of the GUI, according tothe screen size of the external display device. Also, when only theinformation about the screen size of the external display device exists,the scaling ratio and the arrangement of items of the GUI suitable forthe screen size can be calculated in order to rearrange the GUI. Whenthe display device information read in operation 813 or 814 contains thescaling ratio and arrangement information of the GUI, the final GUI isgenerated by rearranging the GUI by using the scaling ratio andarrangement information. When a user has set up a scaling ratio orarrangement of the items of the GUI according to the screen size of theconnected external display device, the GUI may be rearranged by usingsuch information selected by the user.

In operation 816, the generated GUI and a video signal are combined andthen output to the external display device. Accordingly, the externaldisplay device displays the combination of the generated GUI and thevideo signal on the screen.

The invention can also be embodied as computer readable codes on acomputer readable recording medium or other types of computer readablemedia. The computer readable recording medium is any data storage devicethat can store data which can be thereafter read by a computer system.Examples of the computer readable recording medium include read-onlymemory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes,floppy disks, optical data storage devices. An example of other types ofcomputer readable media is carrier waves (such as data transmissionthrough the Internet). The computer readable recording medium can alsobe distributed over network coupled computer systems so that thecomputer readable code is stored and executed in a distributed fashion.

According to aspects of the present invention, convenience for a usercan be increased by providing a suitable GUI according to a connectedexternal display device.

Also, the user can automatically obtain information about the externaldisplay device even if the user does not separately have the informationabout the external display device, and thus an optimum TV-out functioncan be realized.

In addition, the amount of information provided to the user can besuitably adjusted by adaptively changing the size and configuration ofthe GUI according to the external display device, and thus manipulationconvenience for the user can be improved.

While this invention has been particularly shown and described withreference to exemplary embodiments thereof, it will be understood bythose of ordinary skill in the art that various changes in form anddetails may be made therein without departing from the spirit and scopeof the invention as defined by the appended claims. The exemplaryembodiments should be considered in a descriptive sense only and not forpurposes of limitation. Therefore, the scope of the invention is definednot by the detailed description of the invention but by the appendedclaims, and all differences within the scope will be construed as beingincluded in the present invention.

What is claimed is:
 1. An apparatus for processing video, which providesvideo data by being connected to an external display device, theapparatus comprising: a screen, which displays the video data and has ahorizontal length X and a vertical length Y; a display deviceinformation reader, which reads display device information about ascreen size of the external display device including a horizontal lengthX′ and a vertical length Y′; a graphical user interface (GUI) datastorage unit, which stores data about a GUI displayed on the externaldisplay device; a GUI controller, which generates a control signal forchanging at least one of a size and configuration of the GUI accordingto the screen size of the external display device; a GUI generator,which generates a GUI by changing the at least one of size andconfiguration of the GUI according to the control signal; and a videoprocessor, which scales the video data according to ratio of X:X′ and Y:Y′, combines and processes the generated GUI and the scaled video data,wherein at least one of the display device information reader, GUI datastorage unit, GUI controller, GUI generator and video processor, isimplemented as a hardware component, and wherein the GUI generatorcomprises: a GUI scaling ratio calculator, which calculates a scalingratio of the GUI according to the screen size of the external displaydevice; and a GUI changer, which changes the size of the GUI accordingto the calculated scaling ratio, and the GUI scaling ratio is differentfrom X:X′ and Y:Y′.
 2. The apparatus of claim 1, wherein the displaydevice information reader reads the information about a screen size ofthe external display device by being connected to the display deviceusing at least one of wired communication and wireless communication. 3.The apparatus of claim 1, wherein the display device information readerreads the information about a screen size of the external display devicefrom an external server connected through a network.
 4. The apparatus ofclaim 1, wherein the GUI generator further comprises: a GUI generationinformation storage unit, which contains at least one of scaling ratioinformation of the GUI and configuration information of the GUIaccording to the screen size of the external display device; and whereinthe GUI changer changes the at least one of size and configuration ofthe GUI by using the at least one of scaling ratio information andconfiguration information.
 5. The apparatus of claim 4, wherein thescaling ratio information is an enlargement ratio or reduction ratio ofat least one of a horizontal and vertical component of the GUI based onthe size of the GUI stored in the GUI data storage unit according to thescreen size of the external display device.
 6. The apparatus of claim 4,wherein the configuration information includes arrangement informationof items of the GUI displayed on one screen according to the screen sizeof the external display device.
 7. The apparatus of claim 1, wherein thedisplay device information further comprises scaling ratio informationof the GUI and configuration information of the GUI according to thescreen size of the external display device, and the GUI generatorchanges the size and configuration of the GUI by respectively using thescaling ratio information and the configuration information included inthe display device information.
 8. The apparatus of claim 1, wherein theGUI controller controls the data about a GUI so as to be stored in theGUI data storage unit by receiving the data of a GUI suitable for aresolution of the external display device from outside, according to theresolution of the external display device.
 9. The apparatus of claim 1,further comprising an input video scaler, which determines a video typeof the input video signal and scales a predetermined portion of theinput video signal according to a selection of a user or a requirementof a system.
 10. A method of scaling video displayed on an externaldisplay device, the method comprising: reading display deviceinformation, using a display device information reader about a screensize of the external display device including a horizontal length X′ anda vertical length Y′; generating a graphic user interface (GUI), using aGUI generator, by changing at least one of a size and configuration of aGUI displayed on the display device according to the screen size of thedisplay device; scaling video data provided with the external displaydevice according to ratio of X:X′ and Y:Y′, where X is a horizontallength and Y is a vertical length of a screen of an apparatus providingthe video data and displaying the generated GUI on the display deviceafter combining the generated GUI with the scaled video data, wherein atleast one of the display device information reader and the GUIgenerator, is implemented as a hardware component, and wherein thegenerating of the GUI comprises: calculating a scaling ratio of the GUIaccording to the screen size of the external display device; andchanging the size of the GUI according to the calculated scaling ratio,and the GUI scaling ratio is different from X:X′ and Y:Y′.
 11. Themethod of claim 10, wherein the reading of the display deviceinformation comprises reading the information about the screen size ofthe external display device by connecting to the external display deviceusing at least one of wired communication and wireless communication.12. The method of claim 10, wherein the reading of the display deviceinformation comprises reading the information about the screen size ofthe external display device from an external server connected through anetwork.
 13. The method of claim 10, wherein the generating of the GUIfurther comprises: reading at least one of scaling ratio information ofthe GUI and configuration information of the GUI according to thepre-stored screen size of the external display device; and changing theat least one of size and configuration of the GUI by using the at leastone of scaling ratio information and configuration information.
 14. Themethod of claim 13, wherein the scaling ratio information is anenlargement ratio or reduction ratio of at least one of a horizontal andvertical component of the GUI based on the pre-stored size of the GUIaccording to the screen size of the external display device.
 15. Themethod of claim 13, wherein the configuration information containsarrangement information of items of the GUI displayed on one screenaccording to the screen size of the external display device.
 16. Themethod of claim 10, wherein the display device information furthercomprises scaling ratio information of the GUI and configurationinformation of the GUI according to the screen size of the externaldisplay device, and the generating of the GUI changes the size andconfiguration of the GUI by respectively using the scaling ratioinformation and the configuration information contained in the displaydevice information.
 17. The method of claim 10, further comprising:receiving and storing data of a GUI suitable for a resolution of thedisplay device according to the resolution of the external displaydevice; and generating the GUI by using the data stored according to theresolution of the external display device.
 18. The method of claim 10,further comprising: determining a video type of the input video signal;and scaling a predetermined portion of the input video signal accordingto a selection of a user or a requirement of a system.